Built to be waterproof, shockproof, and rugged (good for camping/outdoor/travel use).

Has a regular MicroUSB input for charging the battery pack, just like all portable batteries have, plus has a solar panel which continuously recharges the device.
They do not suggest abandoning regular charging for solar because of slow charging rate,
but the solar panel can add up to 15% daily charge to the battery capacity.

Prime members get free 2-day shipping or free same-day shipping, depending on how many other items are in your Amazon Prime order.